Effect of grinding on the fractional composition of polymineral laminated bituminous shales

ABSTRACT

The effects of size reduction on oil shales from the Yaregskoye oil field were conducted. These shales are characterized by lamination and by high degree of schistosity and expressed zones of pyritization and bituminization. The influence of the level of crushing on the distribution and composition functions was studied. Size separation as a method for the preconcentration of this material at the ore preparation stage was substantiated. The results obtained using predictive formulas showed the possibility of obtaining a product with an increased TiO₂ content at the ore preparation stage and a reduced amount of material requiring processing.

KEYWORDS:

• Grinding
• fractional composition
• distribution function
• content function
• polyminality
• granulometric characteristic